raw_binary_to_string.ex

defmodule StringUtil do

  def raw_binary_to_string(raw) do
    raw
    |> String.codepoints()
    |> Enum.reduce(fn(w, result) ->
      if String.valid?(w) do
        result <> w
      else
         << parsed :: 8>> = w
         result <>   << parsed :: utf8 >>
      end
    end)
   end
 
 end